This is because all water-based materials have been removed and replaced with bake & cake friendly oils; these oils mix through much better than water-based gels (which we know water repels from the oils in your baking).
Dekozauber24 Lime Green oil based food colouring - 11 ml fat soluble and highly concentrated, liquid, lime green food colour for chocolate, cream, ganache & more
Edible Food Colouring Mill Green Oil Based 20ml Cake Decorating Sugarcraft
Green Oil Based Food Colouring New X3 Limino
Colour Mill Oil Blend Food Colouring Green: Next Generation Oil Based Food Colours - 100 ml
Colour Mill Oil Blend Food Colouring Green: Next Generation Oil Based Food Colours - 20 ml
PME Cake Oil Based Food Colour with Precision Dropper | Green (20ml) | High Pigment Oil-Blend Food Colouring for Buttercream Chocolate Ganache Fondant & Cake Batter
